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annotate toolboxes/FullBNT-1.0.7/bnt/inference/online/@jtree_sparse_2TBN_inf_engine/back.m @ 0:e9a9cd732c1e tip

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first hg version after svn
author wolffd
date Tue, 10 Feb 2015 15:05:51 +0000
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wolffd@0 1 function b = back(engine, bfuture, f, t)
wolffd@0 2
wolffd@0 3 if f.t ~= t
wolffd@0 4 error('mixed up time stamps')
wolffd@0 5 end
wolffd@0 6 if t==1
wolffd@0 7 b = back1(engine, bfuture, f, t);
wolffd@0 8 return;
wolffd@0 9 end
wolffd@0 10
wolffd@0 11 bnet = bnet_from_engine(engine);
wolffd@0 12 ss = bnet.nnodes_per_slice;
wolffd@0 13
wolffd@0 14 int = engine.interface;
wolffd@0 15 D = engine.in_clq;
wolffd@0 16 C = engine.out_clq;
wolffd@0 17 phiD = marginalize_pot(bfuture.clpot{D}, int, engine.maximize);
wolffd@0 18 phiD = set_domain_pot(phiD, int+ss); % shift to slice 2
wolffd@0 19 phiC = marginalize_pot(f.clpot{C}, int+ss, engine.maximize);
wolffd@0 20 ratio = divide_by_pot(phiD, phiC);
wolffd@0 21 f.clpot{C} = multiply_by_pot(f.clpot{C}, ratio);
wolffd@0 22
wolffd@0 23 [b.clpot, seppot] = distribute_evidence(engine.jtree_engine, f.clpot, f.seppot);
wolffd@0 24 for c=1:length(b.clpot)
wolffd@0 25 [b.clpot{c}, ll(c)] = normalize_pot(b.clpot{c});
wolffd@0 26 end
wolffd@0 27 b.t = t;